lec18 - ENGR 111 Lecture 18 Reading: Class notes...

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ENGR 111 Lecture 18 Reading: Class notes Howstuffworks web site
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Case Study: Cell phone z How do those cell phones work? z Walk through a big picture study { Tie some of the concepts in communications together
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Cordless phones z Use a base station that is connected to the telephone wire z The handset talks to the base station which sends voice over telephone network z Handset – base station talk over air/wireless channel z Limited to about 1000 feet z Uses 900 MHz or 2.4 GHz frequency band
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Cell phones/ mobile phones z Use similar ideas { A handset/cellphone that we carry { A base station nearby that picks up your phone call and sends it over the network { Longer range more than 1000 feet z Need to stay connected as we move
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First generation mobile service z The entire spectrum is allocated on a Frequency Division basis z Each Call served on a single frequency z Only few users per geographic area { Kings and heads of state
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Current Mobile service z Allocates a frequency when in use { Allows reuse of frequency
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This note was uploaded on 03/26/2008 for the course ENGR 111 taught by Professor Walker during the Fall '07 term at Texas A&M.

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lec18 - ENGR 111 Lecture 18 Reading: Class notes...

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